High frequency line ripple cancellation circuit
US4341990A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 27, 1981 |
| Grant date | Jul 27, 1982 |
| Priority date | — |
| Expiry date | Apr 27, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05F1/565
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
In circuits such as voltage regulators and the like where parasitic currents may be generated as a result of high frequency ripple on the supply line, means are provided to cancel the effects of the parasitic current. A capacitor having a capacitance substantially equal to the parasitic capacitance is adapted to receive the supply voltage excursions and generate a current substantially equal to the parasitic current. A current mirror circuit or the like is employed to either divert this second current from the base of the output transistors or to reduce the drive current to the base of the output transistors by an amount equal to the second current.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.